Fuel Vacuum Carburetor Synchronizer Carb Balancer Sync Gauge Set Auto Tool 4 Kit Universal for most standard carburetors Each 2-inch gauge in this carb synchronizer tool set provides readings from 0 to 76 cm/Hg.Air flow control is managed by needle and seat valves rather than knobs.The kit includes four synchronizer gauges that allow synchronization of up to four carburetors, enabling adjustment and calibration of their values.It assists in diagnosing issues such as spark misfires and poor engine compression. During engine , continuous air intake from the cylinder creates fluctuating pressure within the carburetor.The fixed valve connected to the vacuum pressure gauge regulates airflow in the pipeline, providing a damping effect for more stable readings. Measuring range: Positive pressure: 1 kg/cm², Negative pressure: 70 cm/Hg Package includes: 4 x Synchronizer Gauges with Fixed Plate (vacuum) 4 x Rubber Pipes 8x5x750mm 4 x Connectors M5xP0.8x99mm (L) 4 x Connectors M5xP0.8x169mm (L) 4 x Connectors M6xP0.75x53mm (L) 4 x Connectors M6xP1.0x60mm (L) 1 x Connector 6x60mm (L) Materials: brass + plastic Weight: 3120g Packing size: 42x31.5x10cm Features: Includes various carburetor adapters with a selection of long and short connectors for compatibility with different setups. Designed for straightforward use in synchronizing and adjusting up to four carburetors. Supplied in a plastic carrying case with handle and locking closure for transport, storage, and organization. Box color may vary. This product is an aftermarket solution.Brand names are mentioned only to clarify compatibility with specific models.